docs: def _create_subviews(path, corpus):
          """ Load the subviews based on testing_list.txt and validation_list.txt """
          test_list_path = os.path.join(path, 'testing_list.txt')
          dev_list_path = os.path.join(path, 'validation_list.txt')
  
          test_list = textfile.read_separated_lines(test_list_path, separator='/', max_columns=2)
          dev_list = textfile.read_separated_lines(dev_list_path, separator='/', max_columns=2)
  
          test_set = set(['{}_{}'.format(os.path.splitext(x[1])[0], x[0]) for x in test_list])
          dev_set = set(['{}_{}'.format(os.path.splitext(x[1])[0], x[0]) for x in dev_list])
          inv_train_set = test_set.union(dev_set)
  
          train_filter = subview.MatchingUtteranceIdxFilter(utterance_idxs=inv_train_set, inverse=True)
          train_view = subview.Subview(corpus, filter_criteria=train_filter)
          corpus.import_subview('train', train_view)
  
          dev_filter = subview.MatchingUtteranceIdxFilter(utterance_idxs=dev_set, inverse=False)
          dev_view = subview.Subview(corpus, filter_criteria=dev_filter)
          corpus.import_subview('dev', dev_view)
  
          test_filter = subview.MatchingUtteranceIdxFilter(utterance_idxs=test_set, inverse=False)
          test_view = subview.Subview(corpus, filter_criteria=test_filter)
          corpus.import_subview('test', test_view)